A non-destructive and on-line diffusion tracing in Li ionic conductors was demonstrated. As the tracer, the pulsed beam of the short-lived α-emitting radioisotope of 8Li was implanted into a typical Li ionic conductor LiGa. By analyzing the time-dependent yields of the α-particles measured in coincident with the repetition cycle of the beam, the tracer diffusion coefficients were extracted with a good accuracy. The ordering of the Li vacancies in the Li-deficient β phase of LiGa was observed for the first time in terms of the Li diffusion by the present method.

On-Line Diffusion Tracing in Li Ionic Conductors by the Short-Lived Radioactive Beam of 8Li. S.C.Jeong, I.Katayama, H.Kawakami, Y.Watanabe, H.Ishiyama, N.Imai, Y.Hirayama, H.Miyatake, M.Sataka, H.Sugai, S.Okayasu, S.I.Ichikawa, K.Nishio, S.Mitsuoka, T.Nakanoya, T.Hashimoto, M.Yahagi, T.Hashimoto: Japan Journal of Applied Physics, 2008, 47, 6413-5